chem final

Aqueous silver nitrate reacts with aqueous sodium chloride producing a precipitate of silver chloride.

1_AgNO3(aq) + _1_NaCl(aq) →_1_AgCl(s) + _1_NaNO3(aq)

From a Ziploc bag of macaroni, how would you find the average mass of one macaroni noodle?

Count 20, weigh the total of 20 macaroni, divide the mass of all 20 by 20 get the average mass of one macaroni

This is the name of the element with 19 protons and a mass number of 39

Krypton

Lithium bromide has this formula

LiBr

Which has more atoms, 5 grams of calcium, or 5 grams of magnesium>

Magnesium, 1 mole of Calcium = 40.078 grams, 1 mole of Magnesium = 24. 31 grams 1 gram of Ca = 1/40.078 moles , 1 gram of Mg = 1/24.31 moles, so......, 5 gram of Ca = 5/40.078 moles , 5 gram of Mg = 5/24.31 moles 5 gram of Ca = 0.124 moles, 5 gram of Mg = 0.206 moles 0.124 moles < 0.206 moles, 5 grams of Mg has more molecules!

Most of the elements on the Periodic Table belong to this category

Metals

Of Mg, K, O or Cl, the element that would be most chemically similar to Ca is this

Mg

Based on their placements on the Periodic Table, Mg and Cl would react to form a compound with this chemical formula

MgCl2

Magnesium Chloride formula

MgCl2

Mg+2 and O-2 bond to form a compound with this chemical formula

MgO

How many moles of NaCl do you need to react with 0.10 mol of AgNO3?

Mole ratio is 1:1 so you only need 0.1o moles of

Sodium Oxide

Na2O

Draw a mixture of different kinds of atoms.

NaCl+H2O

Sodium Hydroxide

NaOH

Is heat an example of matter?

No heat is energy because matter takes up space and heat doesn't take up any space

Helium, Neon and Argon are members of this family.

Noble Gases

The family of elements including Cl is called this.

Nonmetals and also the Halogens

A base increases the concentration of this ion when added to a solution

OH-

The type of an ion formed by a combination of two or more atoms like SO4-2

Polyatomic ion

K3N

Potassium Nitride

Is dust an example of matter?

Yes dust is matter because it takes up space

A stable atom of Al has this many electrons

13

Based on its placement on the Periodic Table, the Na ion would have this charge

+1

Based on its placement on the Periodic Table, the O ion would have this charge.

-2

312 grams of Al(OH)3 would be this many moles of hydroxide ions.

. Since there are 3 moles of OH- for each mole of Al(OH)3 you just need to convert moles of Al(OH)3 to moles of OH- 4 moles Al(OH)3 x (3 moles OH- /1mole Al(OH)3) = 12 moles OH-

ph scale

0-14

. What is the pH range of an acid

0-7

Which has the highest molarity? 50 mL of a solution which contains 0.5 moles NaOH 50 mL of a solution which contains 5 moles Mg(OH)2 100 mL of a solution which contains 0.25 moles Ca(OH)2

0.5/ 0.05= 10 5/0.05=100 .25/.1=2.5

The isotope of manganese with a mass number of 55 has this many neutrons

30

You have an empty Ziploc bag with a mass of 3.0 g. After pouring in a cup of macaroni noodles, the new mass is 48.6 g. If the average mass of a macaroni noodle is 0.5 g, how many noodles are in the bag?

48.6- 3.0 (bag) = 45.6 g. divide the total mass of all the macaroni by the individual grams of one macaroni to get the number of macaroni. 45.6/0.5=91.2 macaroni. (probably 91 macaroni if none are broken).

Balance equation

4NH3 + 3O2 --> 2N2 + 6H2O

What is the molarity of a 500 mL solution which contains 6 moles of a substance?

6/0.5L=12 Molar solution

Neon has this many electrons in its outermost electron shell

8

The element, oxygen, has this many protons in its nucleus

8

Which one has more weight 100 atoms of carbon or 1oo atoms of sulfur

A set number of sulfur atoms will weigh more then carbon.

HCl acid or a base

Acid

Is vinegar an acid or a base?

Acid

Based on their placements on the Periodic Table, Al and S would react to form a compound with this chemical formula

Al2S3

In this type of radiation, (alpha, beta, gamma), the nucleus of an atom gives off a He nucleus, (2 protons and 2 neutrons)

Alpha decay

What is the difference between an atom and a molecule?

An element is only one type of material, a compound is a molecule made up of multiple elements.

What are some examples of mixtures

Ar+ O2+ He+ N2+ CO2+ H2O or

What is the number of protons in an atoms nucleus?

Atomic Number

Elements are arranged in order of increasing

Atomic Numbers and atomic

To balance this equation, the coefficients in order are: 2KClO3 --> 2KCl + 3O2

Balanced

Is NaOH an acid or a base

Base

. In this type of radiation, (alpha, beta, gamma), a neutron in the nucleus becomes a proton and an electron and the electron is emitted.

Beta decay

. As a demonstration of ocean acidification, blowing ___¬¬________into water will create carbonic acid.

CO2

Ca+2 and PO4+3 bond to form a compound with this chemical formula

Ca3(PO4)2

What is the name for CaCl2

Calcium chloride

Find the density of an object whose mass is 2.6 grams and whose volume is 0.36 mL.

D=7.2 g/mL

Balace equation

Fe + 3H2SO4 --> Fe(SO4)3 + 3H2

2.5 moles of HNO3 would have a mass of this many grams.

Find out how much one mole of HNO3 weighs first. Nitrogen's molar mass = 14, Hydrogen's = 1.01, Oxygen's = 16. One atom of N = 14, plus three of O = 48 and one of H = 1, total is 63 grams for one mole or grams/mole. 2.5 moles of this = 63*2.5 = 157.5 grams.

312 grams of Al(OH)3 would be this many moles of aluminum hydroxide.

Find out how much one mole of aluminum hydroxide weighs first. Aluminum's molar mass = 26.98, Hydrogen's = 1.01, Oxygen's = 16. One atom of Al = 26.98, plus three of O = 48 and three of H = 3, total is 77.98 grams for one mole or grams/mole. If you are given 312 grams, and the compound is 77.98 grams/mole, 312 grams x (1 mole Al(OH)3 /77.98 grams), = 4 moles!

. An acid increases the concentration of this ion when added to a solution.

H+

Define an isotope

Same number of protons different number of neutrons

The state of matter that has a definite volume and shape.

Solid

What can you say about objects that have the same densities but different shapes?

They are the same mass and volume

beta decay

atomic number increases by one

what is density

density measures mass per unit of volume

Mass

how much an object weighs

Volume

how much space an object takes up

alpha decay

mass reduced by 4 atomic number reduced by 2

What is molarity?

moles/liter

Animals that are affected by ocean acidification

oysters fish and mussels

horizontal row on the periodic table

period